Use mcp tools for filter chain (#621)

* agents framework demo

* more changes

* add more changes

* pending changes

* fix tests

* fix more

* rebase with main and better handle error from mcp

* add trace for filters

* add test for client error, server error and for mcp error

* update schema validate code and rename kind => type in agent_filter

* fix agent description and pre-commit

* fix tests

* add provider specific request parsing in agents chat

* fix precommit and tests

* cleanup demo

* update readme

* fix pre-commit

* refactor tracing

* fix fmt

* fix: handle MessageContent enum in responses API conversion

- Update request.rs to handle new MessageContent enum structure from main
- MessageContent can now be Text(String) or Items(Vec<InputContent>)
- Handle new InputItem variants (ItemReference, FunctionCallOutput)
- Fixes compilation error after merging latest main (#632)

* address pr feedback

* fix span

* fix build

* update openai version

crates/brightstaff/src/handlers/jsonrpc.rs

@@ -0,0 +1,49 @@
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+
+pub const JSON_RPC_VERSION: &str = "2.0";
+pub const TOOL_CALL_METHOD : &str = "tools/call";
+pub const MCP_INITIALIZE: &str = "initialize";
+pub const MCP_INITIALIZE_NOTIFICATION: &str = "initialize/notification";
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(untagged)]
+pub enum JsonRpcId {
+  String(String),
+  Number(u64),
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct JsonRpcRequest {
+  pub jsonrpc: String,
+  pub id: JsonRpcId,
+  pub method: String,
+  #[serde(skip_serializing_if = "Option::is_none")]
+  pub params: Option<HashMap<String, serde_json::Value>>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct JsonRpcNotification {
+  pub jsonrpc: String,
+  pub method: String,
+  #[serde(skip_serializing_if = "Option::is_none")]
+  pub params: Option<HashMap<String, serde_json::Value>>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct JsonRpcError {
+  pub code: i32,
+  pub message: String,
+  #[serde(skip_serializing_if = "Option::is_none")]
+  pub data: Option<serde_json::Value>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct JsonRpcResponse {
+  pub jsonrpc: String,
+  pub id: JsonRpcId,
+  #[serde(skip_serializing_if = "Option::is_none")]
+  pub result: Option<HashMap<String, serde_json::Value>>,
+  #[serde(skip_serializing_if = "Option::is_none")]
+  pub error: Option<JsonRpcError>,
+}